Coil winding apparatus



Sept. 2, 1952 J. LA CESA 2,609,163

COIL WINDING APPARATUS Filed Feb. 19, 1948 4 Sheets-Sheet 1 Sept. 2, 1952 J. LA cEsA COIL WINDING APPARATUS 4 Sheets-Sheet 2 Filed Feb. 19. 1948 p 2, 1952 J. LA CESA 2,609,163

COIL WINDING APPARATUS Filed Feb. 19. 1948 4 Sheets-Sheet 5 Patented Sept. 2, 1952 UNITED STATES PATENT OFFICE.

"con. WINDING APPARATUS Joseph La Cesa, Chicago, Ill. A plication February 19, 1948; Serial No 9,483 1 This invention relates to improvements in coil winding apparatus and it consists of the matters hereinafter described and more particularly pointed out in the appended claims. The apparatus is more especially intended for winding coils for electromagnets, solenoids, motor coils and other electrical devices.

One of the objects of the present invention is to provide a coil winding apparatus of the kind mentioned which, though of a simple construction, is capable of fast and accurate production of coils of uniform size and arrangement;

Another object of the invention is to provide apparatus of this kind which may be easily adjusted to produce coils of various different sizes and which will notget out of the adjustment for which it has been set and thereby produce non-- requiring extensive readjustments in the appa- U ratus.

Again, it is an object of the invention to provide apparatus having an improved wire laying feed including a feed screw driven carriage, which may be adjusted to take up wear and which 15 Claims. (Cl. 242158) may be readily adjusted and set when it isnecas well as others, together with the advantages thereof will more fully appear as the specification proceeds.

In the drawings:

Fig. 1 is a top plan view of a coil winding apparatusembodying the preferred form of the invention. Fig. 2 is a view in side elevation of the apparatus, as viewed from. the wire feed side thereof at the top of Fig. l, certain of the parts appearing in vertical section for a better thereof. v I

Fig. .3 is a transverse detailvertical sectional view through parts of the feed carriage, as taken on the line 3-3 and on a scale enlarged over "that of Fig. 1.

Fig. 5 is a vertical sectional view through the y L illustration brake mechanism'of the apparatus, as taken on the line 5-5 and'on a scale enlarged over that of Fig. 1 and shows said mechanism in its set position to hold the winding mandrel against rotation. I

Fig. 6 is a diagrammatic view of the electric circuit for the apparatus, which will be more fully referred to later. a

Referring'now in detail to that embodiment of the invention illustrated in the drawings, the improved apparatus-includes a generally rectangular base l0, upon whichother parts of the apparatus are mounted and-which base may be disposed for support upona suitable bench or the like, not shown. This base is deeper from front to rear than it is wide and the front thereof. at which the attendant or operator is stationed, is indicated in Fig. 1 by the letter F.

Disposed along thefrontof thebase is the power driven mandrel ll ofthe apparatus, which is journalled for rotation in standards 12 and 13 respectively, rising from the base and best appearing in Fig. '1. On that part of the mandrel journalled. in the standard 13 and extending therebeyond is a braking disc Hand a pulley l5 respectively. Theother end, ofsaid mandrel be yond thestandard i2: is provided witha hand wheel I6, by which the mandrel may be turned by hand when necessary; Also operatively engaged on said other end of the mandrelbeyond the hand wheel is an arbor H to receive one or more forms (not shown). upon which, a coil is to be wound.

At the rear end of the base is a universal type of electric motor; [8, which may be caused to run in either direction and pulleys l9 and 20 respectively are. fixed to the armature thereof. The pulley 20 is in alignment with the pulley I5 on the mandrel and drives the same through a belt 2|.

At the frontof the base is a'mechanism 22 for counting the number of turns of the mandrel H and which will be the number of turns v(forth and back) to be wound upon the coil form on the arbor 11. Thi mechanism is of the kind known as a high speed predetermining counter and it can be set for any desired number of turns within-its capacity and when the set number is reached, said mechanism will make or break the circuit of the apparatus and stop the same. Thereafter the counting wheels of the mechanism are manually reset to zero to start a new count. Such a counter mechanism is conventional and may be obtained in the open market and no claim is-made thereto per'se." The 3 mechanism 22 is suitably supported from the base [0, adjacent the mandrel ll between its supporting standards [2 and I3, within convenient view of the operator from the station F. The counting wheel shaft of this mechanism, which is indicated at 23 (see Fig. 1) ha a bevel gear 24 thereon, adjacent the mandrel ll. Longitudinally adjustable on said mandrel are bevel gears 25-26 either of which may be moved into operative driving mesh with the gear-24 to drive the same and the counter mechanism. When the mandrel H is being driven in one direction, the gear 25 is adjusted into mesh with the gear 24 and the other gear 26 is adjusted out of mesh therewith, as in Fig. 1. When the man drel is being driven in the other direction, the gear 26 is adjusted into mesh with the gear 24' and the other gear 25 is adjusted out of mesh,

therewith. Set screws 25s and 26s respectively are provided to hold the gears 25 and 26 in desired set position. Thus, no matter in which direction the mandrel is driven as for making a left hand or a right hand wound coil, the counter mechanism is driven in the proper counting direction. I

When the counting mechanism has reached the count or number of turns for which it has been set, it operates through a circuit later mentioned, to stop the motor l8. To prevent any overrun of the mandrel, after the motor has been deenergized, and which would produce a non-uniformity in the coils wound by the apparatus, I provide an electromagnetic braking mechanism, which is associated with the brake drum or disc l4. This mechanism best. appears in Fig. 5.

Said braking mechanism includes a semicircular flexible brake band 21 that is disposed for braking engagement with the rear peripheral side of the drum or disc [4. The bottom end of said band is mounted for operative movement on a stud 2'8 projecting laterally from a part of the standard l3 by means of a block 29 having a slot 36 therein through which the stud 28 extends. The rear end of this block is bifurcated to engage upon opposite sides of an extension 31 on this end of the band and the bifu'rcated end of the block is pivoted to the. extension by a pin 32. The front end of the block carries an adjustingv screw 33 arranged to engage the stud 28 and the purpose of this screw is to adjust the band to take up any wearv therein as the same becomes necessary. H

The upper end of the band includes an extension 34, to which the bottom end of an upstanding lever 35 is pivoted by a pin 36. The mid portion of this lever fulcrums or rocks against an adjustable stud 31 carried by a lateral flange 38 on the standard [3. A tension screw 39, disposed below the stud 3 1 is pivoted at one end on the pin 36 and slides through the flange 38 and is provided at its forward end with adjust ing nuts 40. A spring 4| surrounds that part of the screw 39 between said flange '38 and nuts 40' and normally tends to swing the lever 35 counterclockwise about the stud 3'! as a' fulcrum, as viewed in Fig. 5. This normally acts to urge the brake band 21 into braking engagement on the periphery of the drum.

To release the brake in timed relation to the start of a coil winding operation, there is provided an electromagnet 42 rearwardly of the brake drum and this magnetic coil is supported in an upright position by means of a bracket 43 (see Fig. 5) rising from the base 16. The armature for said coil is indicated at 44 and it extends upwardly therefrom. Its upper end is connected by a link 45 with the rear end of a lever 46, the front end of which is pivoted on a stud 41 extending laterally from the standard [3. The front end of said lever is flat and it normally engages the upper end of the rear side of the lever 35. On this lever 46 is located a switch 48, the purpose of which will later appear.-; When the magnet coil 42 is energized, it will retract its armature and rock the lever 46 counterclockwise, as viewed in Fig. 5. In this rocking of said lever, its flat front end, which engages the upper end of the lever 35, functions as a cam, to swing said lever clockwise about the fulcrum stud 31, against the action of the spring 4|. This releases the braking'actio'n of the band 21 relative to the drum l4 so that the mandrel H can freely rotate. When the coil 42 is deenergized, the spring 4| functions immediately to set the brake band 21 on'the drum and stop the mandrel.

Rising from .the base '16 rearwardly of the mandrel are laterally spaced upright standards 5| and 52 respectively, best appearing in Fig. 1. These standards extend parallel with opposite sides of the base l6. Journalled at their ends in these standards are laterally spaced feed screws 53 and 54 respectively and adjacent the standard 52, these screws carry meshing gears 55 and 56 respectively, which best appear in Fig. 2. The feed screw 53 has an extension 53a, (best shown in dotted lines in Fig. l) and to which is fixed a pulley 51. By means of the ears 5556, the feed screws are rotated in opposite directions.

Located on thebase i6, between the pulley 51 and the motor 18, is a stepless variable speed pulley set, indicated as a whole in Fig. l, by the numeral 58. It includes a pair of axially movable pulleys 59 and 60 respectively that are mounted onv a shaft 6| carried by the upper end of a bracket 62 that is pivoted at its bottom end as at 63 on the base so as to be swung forwardly or rearwardly of the base. The pulleys of this set are connected by belts 64-65 with the pulleys 51 and I9 respectively, before mentioned, whereby the feed screws 5354 may be driven as a unit at different speeds from the motor I8 without affecting the drive between the pulleys 20 and l5.

The bracket 62 may be swung rearwardly or forwardly of the base and in this movement the effective diameter of the pulleys 59 and 66 are changed in proportion, i. e. when the effective diameter of the pulley is increased, the effective diameter of the pulley 66 is decreased and vice versa. Stepless variable speed pulley sets of this kind are conventional and are obtainable in the market and I make no claim to the structure thereof per se. To swing the bracket 62 in either direction, I provide a threaded shaft 66 that is arranged parallel with the belt 64 and which has a downward pitch from front to rear. The rear end of thisshaft has a universal yoke connection 6! with the upperend of the bracket 62 while the front end of said shaft has threaded engagement through a stud 68, pivotally engaged in an upper end extension of the bracket 52. On this front end of the shaft forwardly of the stud 68 is a hand wheel 69 and by which the shaft may be turned in either direction. When said shaft 66 is turned in either direction, it will cause a swinging movement of the bracket 62 and cause a change in the relative effective diameter of the pulleys 59 and 60 and thus prov ducea variation in drive from the motor l8 to the feed screws 53-54; X

Associated with the feed screws 53-54 is a wire lay or layer feed carriage which is adapted for a forth and back movement as produced by the feed screws 53-54 and which carriageucarries anextension that supports guide means for the wire to be woundinto a coil. The 'travelcf this carriage determines the length of lay or layer of wire in the coil. Y

This carriage is best shownin Figs." 31and"'4 and it embodies therein a. h'orizontallydisposed plate 10 that includes an upstandingboss 1|.

Fixed in this boss is a tubular shaft'123 that slides through the standard 5| and also slides upon an interior shaft 13 fixed in the standard 52. This structure provides a sliding guided back and forth movement for thecarriage in the direction of the length of the feed screws 53-54.- The carriage supports a pair of depending solenoids 13-14, each including. an upstanding: armature 1 5-16 and the upper ends of which extend up through suitable holes in the carriage. 11 indicates a lever mounted on-thetubular shaft 12 for a rocking movement' a'ri'cl' this'i-leyer includes laterally extending like arms 18, each overhanging an armature 15-16. Pivotally mounted on each arm as at 19 is a half-nut80, each adapted for engagement with the underside of an associated feed screw 53-54. Each arm has pivotally connected 'thereto-the'upper' end of a link 8|, the lower end of which is threaded into the upper end of a block 82, pivoted on a: cross pin 83 carried by the upper end of an associated armature 15-16. 'When eithersolenoid is energized, it attractsits armature 15-16 and imparts a downward pull on the associated arm of the lever 18 and causes the lever to rock,-.so as to disengage its associated half nut from: one of the screws 53-54 and engage the other half nut with the other of said screws. Thus, when one half nut is engaged with its feed screw, and the same is being driven, the carriage travels in one direction along'the' feed-screws for" a leng'thor distance equal to the length of a layor layer of wire to be wound upon the coil form. When this distance is reached, suitable means later to be described, function to cause a reversal-of the half nuts so that'the carriage travels in the other direction for the length of the next lay wound on the coil form.

,The length of the travel of the carriage forth and back is *controlled"electrically and therefore the'carriage includes a contact 84 (see Fig. 1) which travels with the carriage. Associated with the contact 84 are contacts 85-86; which are adjustably fixed in the standards 5I-52 in line with the contact 84, by means of set screws 81-88 respectively. The'contacts 8'5-86'arein the form of rods and these may be adjusted toward or away from each other, so as to determine the length of the lay or layer of the wire to be wound upon the coilform. Inthe movementof the carriage, the contact 84 thereon will engage say the contact 85 and this will actuate the solenoids, to rock the lever 18' and shift the half nuts so that the carriage is caused to travel in the other direction. When the con--' tact 84 reaches the other contact 86 and engages therewith, the carriage is caused to travel in the other direction so that a forth and back movement of the carriage is provided therefor and which, as before mentioned, determines the length ofeach lay or layer of wire for the coil. 'In making an: adjustment or change ofnthe 6: contacts -86 from one length of lay or layer to 'another, the adjustment is made when the apparatus isv in an idle condition and at which time the feed screws 53-54 are not being driven. This necessitates a manual shift of the carriage along the feed screwsv and from which both half nuts must be disengaged from their respective feed screws. To make this manual shift of the carriage there is fixed to the upper surface of the lever 18 a member 89 having extension finger pieces 90-90 of limited flexibility. Beneath eachfing'er there rises from the carriage an adjustablestop 9l'ztherefor. These parts best appear in FigJB. A

By spanning the feed screws 53-54 with the thumb and one finger of the hand, either piece 90-90 may be depressed to free that half. nut engaged with-its feed screw, so that both half nuts are then .free from their respective feed screws and whereby the carriage may be freely moved therealcng in either direction when setting the lever to engage either of the contacts 85-86 in a new adjustment thereof.

1 The tubular shaft 12 carries an arm 93 upon which are rotatively mounted tension devices 94 for the wire and which directs the same upon the form on the arbor I1 and such a wire is indicated at 95 in Fig. 2. This wire is fed from a reel 96 and suitable tension and guide means 91 mounted on a stand 98 that may be disposed at a point to the rear of the base.

In Fig. 6 is illustrated diagrammatically a circuit for the apparatus. Said circuit includes main current conductors I00-IOI, a relay I02, which is associated with the counter mechanism and reduces. the voltage thereof, a duplex relay I03 for the solenoid coils 13-14 on the carriage 10 and the reversing contacts 84-85 and 86 and connected thereto by the conductors I04-l05 and I06 respectively. One side of the solenoid is connected by lines I01-I08 to certain of the terminals in the relay I03 andthe other side of said coils are both connected to the conductor I00 by a conductor I09. A line H0 leads from the other conductor IM to and through one of the coils in the relay I03 and leads to the line I 09. The main shut-off switch is indicated at III. The solenoid coil for the brake is indicated at 42, as before and. I8 indicates the motor in this circuit. The switch in the counter mechanism 22 is indicated at H2 and the maintaining or operating switch is indicated at 48, which switch is carried by the lever 46 of. the brake mechanism and includes a contact member II3 (see Fig. 5) for engagement with the standard I3 for closing the circuit for a starting for each coil winding operation. This switch is preferably pedal actuated by the operator and when it is closed, the motor I8 is energizedand the apparatus is in operation and runs automatically until the predetermined number of turns of wire for which the counter 22 is set is reached. When the switch H2 in the counter operates, it opens the circuit so that the apparatus is stopped.

In operation, the operator places a coil form on the arbor I1 and anchors the end of the wire 95 thereto after passing the same through the tension devices 94. Assume now that the counter 22 has been set for the number of turns of wire required in the coil. By stepping on the pedal, before mentioned, the maintaining switch I I I is caused to release the brake from the holding action of the spring 4|. This closes the circuit to the motor I8 and starts it into operation so that it drives the mandrel. Closing of the circuit energizes oneof thesolenoids 13-l4 so that one of the half nucs -ao engages its associated feed screw :53 or 5.4, as the case may :be, so that the earriage travels longitudinally-in .one .diirectionialong the screws ;53--54. Inrthismovementof: the carriage, the tubular shaft "I2 ,moves longitudinally therewith and through the tensionldevices .94, lays each turn of wire :in its proper .place in its layer. When the carriage has completed a movement in one direction andihas laid alayer of wire, its contact 84 will engage one orithe other of the contactsilS; or 86 andwill energize theother solenoid 13 or and cause a reversal of movement of the carriage so that the nextlayer of wire is laid on the coil.

.Each layer .of wire on the .coil is predetermined accordingto the .setting of the contacts 8586 and' thisbuildingup .of the layers is continued automatically until the counter 22 reaches that number of turns for which it has been set. At this time it will function through its switch H2 to stop .the .motor 18 andcause application .of the brake 2ll4 so that .no .overrun canooour, because of momentum, as to the number of turns incorporated in .thezcoil being wound. This insures uniformity in production.

When the apparatus stops upon the completion of winding a coil, the operator cuts the wire nearlithe coil and anchors :the end of .thecoil in place. The coil and form is then;removedfrom the arbor and .another :coil "form substituted therefor and the operator .starts another operation by the actuation ofthe switch .48.

If desired, an arbor holding several coil forms mayrbe employed so as to wind apluralityofcoils atone time. This, .of course, wouldznecessitate providing a tension 94 on the tubular shaft 12 for each coil, the winding .of .all of said .coils occurring simultaneously.

.iThe apparatus, when started .into operation, is automatic .andiiast in operation, is :durable and is accurate in operation'ior uniform production and is flexible in such operation and 'is capable of windin cores with paper insulating section, solenoid, field and motor lcoilszof many diiierent -shapes .and. sizes.

While in describing the invention '1 have referred in detail to .theform, arrangement and construction of the parts involved therein, the same is to be considered .onlyintheillustrative senseand therefore I do not wish .to .be limited thereto except as -.may.be specifically setforth in the appended claims.

I .claim as my invention:

Coil winding apparatus embodying therein a wirelaying carriage, means upon which said carriage is mounted for aforth and back move ment -thereon,-a-lever mounted on-said carriage fora rocking movement in aplane transversely of the plane of movement of saidcarriage, rotatively -mounted laterally spaced feed screws arranged parallel with the'line of movement of the carriage, half nuts mounted on said lever for engagement with an associated *feed screw and adapted in the rocking movement of'said lever to be alternately engaged with and disengaged from said feed screws, electromagnetic -means mounted on said carriage, one for each half nut and each including an armature, means for connecting parts of :saidlever on opposite sides of the-rocking axis thereof, each with an-armature, a circuit for said electromagnetic means, and means operative as the carriage reaches the limit of its movement in one direction for disconnecting an-electromagnetic means from'sai'd 8. circuitand connecting the other electromagnetic means thereto to cause a reversal of'movement of the carriage.

.2. Soil winding apparatus embodying therein laterallyspaced feed screws, ,a wire laying carriageymeansprovidinga guided forth and back movement of said oarriagein a plane parallel with said ieed screws, a lever mounted 'on said carriage for ,a rocking movement transversely of the feed screws and including oppositely extending arms, ahalf nut carried by each arm and each associated with a feed screw for engagement with and disengagement therefrom;in the rockingmovement of said lever,-an electromagnetic .coil, one for each arm and mounted onthe carriage, an armature for each coil and operatively connected to an associated arm, and operating when energized torock said lever to disengageone half nut from its feed screw and toengage the other half nut with its reed screw. and manually operable means for disengaging bothynuts from the associated ,feed screws when both ,coils are deenergized so that the carriage maybe manually shifted inthe direction of its line of movement.

3. Coil windingapparatus embodying therein laterally spaced, oppositely rotatable parallel feedscrews, a stationary ,guide parallel with said screws, means mounted for a back and forth longitudinal movement, on said guide and adapted for carrying a-wire laying means, a carriage movable with said means, a lever capable of ay,rocking movement transversely of the carriage and including ,-end arms, one associated with each feed screw, a half nut mounted on each arm and each including a threadedportion for engagement with its associated feed screw, a plurality of electromagnets -mounted on'said carriage and each including an armature, operatively connected to said arms of said lever to rock the latter-to engage one half nut with its feed screw and to disengage the other half nut from its food screws, and -means operative as the carriage approaches the limit of a lay of wire ineach direction for-alternately energizing'said electromagnets. v

4. Coil winding apparatus embodying therein laterally spaced, oppositely rotatable parallelfeed screws, astationary guide parallel with said screws, means mounted for a back .and forth longitudinal movement .on said guide and adapted for carrying a wire laying means,- a carriage movable with said means, a lever capable of arocking movement transverselyof the carriage and including end arms, one associated with each feed screw, a half nut mounted on eacharm andeach including a threadedportion forengagement-with its associated feed screw, a-plurality of -.electroma gnets mounted on'said carriage andeach including an armature, operatively connected .to .said arms of said .lever to.-rock the latterv toengage-one'half nut with its feed screw andto disengage the other half nutirom its feed screw, an electriccircui't .for said electromagnets and including stationary but adjustable .contacts. spaced apart longitudinally adistance corresponding .to the length of the lay .of wire ,to be made, and .a .contact movable with said carriage and adapted-in the movement thereof to alternately engage said stationary contacts to control the energization of ssaid-electromagnets. 35. Coil -;winding apparatus embodying therein laterally spaced; oppositely rotatable rparallel feed screws,;aistationary guide parallelwith said screws, means mounted for a back andforth longitudinal "movement on said guide and adapted for carrying a wire laying means, *afcarriage movable with said-means, a lever capable'fof a rocking movement transversely of the carriage and including end arms, one associated with each feed'screw, a half 'nut mounted on each arm and each including a' threaded portion-for engagement with its associated feed screw, "a

plurality of electromagnets mounted on saidcarfeed screw, an electric circuit for said electro-' magnets and including stationary but adjustable contacts spaced apart longitudinally a distance corresponding to the length of the lay of wire to be made, a contact movable with the carriage and adapted in the movement thereof to alternately engage said stationary contacts to control the energization of said electromagnets, and means including finger engageable -por tions on said lever for manually rocking the same in a direction releasing both half nuts for said screws to permit a longitudinal movement of said first mentionedmeans and the carriage thereon independently of said feed screws in a setting of said stationary but adjustable'cont'acts to accommodate the length of the lay of wire to be made. 6. Coil winding apparatus embodying therein laterally spaced oppositely rotating feed screws, shaft means between and parallel with said screws, a carriage mounted for longitudinal movement on said shaft means, a lever movable with and mounted for rocking movement on said carriage, about an axis parallel withthe axis of said shaft means, said leverincluding oppositely extending arms, electromagnetic meanson said laterally spaced oppositely rotating feed fscrews,

shaft .means between and parallel with said screws, a carriage mounted for longitudinal movement on said shaft means, a lever movable with and mountedfor rocking movement on said carriage, about an axis parallel with the axis of said shaft means, said lever including oppositely ex- .7

tending Iarms, electromagnetic means on. said carriage and operatively connected to said lever for imparting rocking movement thereto in opposite directions, a half nut pivotally mounted on each arm for rocking movement about an axis parallel with said axis of said shaft means and each of which half nuts is adapted in the rocking movement of said lever, under the action of said electromagnetic means, to be alternately engaged with and disengaged from the associated feed screw.

8. Coil winding apparatus embodying therein laterally spaced oppositely rotating feed screws, shaft means below, between and parallel with said screws, a carriage mounted for longitudinal movement on said shaft means, a lever movable with and mounted for rocking movement on said carriage about an axis parallel with the axis of said shaft means, said lever including oppositely extending arms, electromagnetic means on said 40 carriage and operatively connected to said lever carriage operatively connected to said lever for imparting rocking movement thereto in opposite directions, a half nut mounted on each arm and each adapted in the rocking movement of said lever under the action of said electromagnetic means to be alternately engaged with and disengaged from the under side of the associated feed screw.

9. Coil winding apparatus embodying therein laterally spaced oppositely rotating feed screws, shaft means between and parallel with said screws, a carriage mounted for longitudinal movement' on said shaft means, a lever movable with and mounted ior rocking movement on said carriage, about an aXis parallel with the axis of said shaft means, said lever including oppositely extending arms, electromagnetic means on said carriage and operatively connected to said lever for imparting rocking movement thereto in opposite directions, a half nut on each arm and each adapted in the rocking movement of said lever under the action of said electromagnetic means to be alternately engaged with and disengaged from the associated feed screw, said electromagnetic means comprising a pair of solenoids and an armature associated with eachsolenoid and operatively connected to an associated lever arm.

10. Coil winding apparatus embodying therein laterally spaced oppositely rotating feed screws, shaft means between and parallel with said screws, a carriage mounted for longitudinal movement on said shaft means, a lever movable with and mounted for rocking movement on said carriage, about an axis parallel with the axis of said shaft means, said lever including oppositely extending arms, electromagnetic means on said for imparting rocking movement thereto in op- ,posite directions, a half nut on each arm and each adapted in the rocking movement of said ,lever under the action of said electromagnetic means to be alternately engaged with and disengaged from the associated feed screw, and

means carried by said lever for rocking the same independently of said electromagnetic means into a position disengaging bothsaid half nuts from said screws .to permit a manual shifting of the carriage in either direction longitudinally of said screws.

11. C011 winding apparatus embodying therein riage, about an axis parallel with the axis of said shaft means, said lever including oppositely extending arms, electromagnetic means on said carriage and operatively connected to said lever for imparting rocking movement thereto in opposite directions, a half nut on each arm and each adapted in the rocking movement of said lever under the action of said electromagnetic means to be alternately engaged with and disengaged from the associated feed screw, and means carried by said lever and including parts extending outwardly beyond the ends of the arms of said lever to provide finger engageable parts for manually rocking said lever into a position disengaging both of said half nuts from said screws to permit a manual shifting of the carriage in either direction longitudinally of said screws.

12. Coil winding apparatus embodying therein laterally spaced oppositely rotating feed screws,

shaft means between and parallel with said screws, a carriage mounted for longitudinal movement on said shaft means, a lever movable with and mounted for rocking movement on said carriage, about an axis parallel with the axis of said shaft means, said lever including oppositely extending arms, electromagnetic means onsaid carriage and operatively connected to said lever for imparting rocking movement thereto in opposite directions, a half nut on each arm andeach adapted in the rocking movement of said lever under the action of said electromagnetic means to be alternately engaged with and disengaged from the associated feed screw, and means carried by said lever and-including parts extending outwardly beyond the ends of the arms. of said lever to provide finger engageable parts for manually rocking said lever into aposition disengaging both. of said half nuts from. said screws. to permit a manual shifting of the carriage in either direction longitudinally of saidscrews, and means mountedon. said carriage and affording limiting stops for engagementby saidv parts extending outwardly beyond the ends of said arms of said lever.

13. Coil. winding apparatus embodying. therein laterally spaced feed screws, standards. in which the ends of said screws are journalled, for rotation in opposite directions, a shaft below and midway between said screws and fixed at one end in one of said standards, a member. mounted for a turning as well as a longitudinal movement on said shaft. and slidable throughv the otherv of. said standards, a carriage. mounted on said member for longitudinal movement therewith, a lever mounted on said memberv for rocking movement about an axis parallelto that of said shaft and including laterally extending arms, a half nut carried by each arm and each adapted in the rocking movement of said lever to, be alternately engaged with and disengagedfrom the associated feed screw, and electromagnetic means mounted on the carriage and operatively connected to said lever for imparting said rocking movement to said lever.

14. Coil winding apparatus embodying therein laterally spaced feed screws, standards in which the ends of said screws are journalled, for rotaber for longitudinal movement therewith, a lever 0 mounted on said member for rocking movement about'an axis parallel. to that of said shaft and '12 including laterally extending arms, a half nut carried by each. arm and. each. adapted in the rocking movement of said lever to be alternately engaged with and disengaged from theassociated feedscrew, and electromagneticmeans mounted on the'carriage andoperatively connected to'said lever for imparting. saidrocking movement to saidlever, an electric circuitfor said electromagnetic means and contact members carried-in. part by said standards and in. part 'by said carriage and included. in said circuit for controlling the action of saidelectromagnetic mean inrocking said lever.

15. Coil winding apparatus embodyingtherein laterally spaced feed screws, standardsv in which the ends-of saidscrews are journalled, for rotation in-opposite directions,- ashaft below andmidway between saidscrews andfixed at one end in one of saidstandards, a tubular shaft mounted for a turning aswell as a longitudinal movement on said first mentioned shaft and slidable through the other of said standards, a carriage mounted .on said tubular shaft for longitudinal movement REFERENCES CI-TED The following references are of record in the I file of this patent:

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548,903 Wood Oct.. 29, 1895 1,503,272 Lewellyn July 29, 1924 1,547,274 Varley July 28, 1925 1,826,758 Field Oct. 13, 1931 11,944,581 Snyder Jan. 23, 1934 1,948,776 Thordasson et al. .Feb. 27, 1934 1,990,834 McIlvried Feb. 12, 1935 2,030,988 Hofstetter Feb. 18, 1936 2,159,635 Ranney May 23,1939 2,186,820 Chapman Jan. 9, 1940 2,437,725 Conner Mar. 16, 1948 FOREIGN PATENTS Number Country Date 22,283 Switzerland Apr. 30, 1901 119,153 Germany Mar. 11,1900 

